Process of making alkali perborates.



. UNI ED STATES PATENT. OFFICE.

OTTO LIEBKNECI-IT,-OF FRANKFQRT-oN-T E-MAIN, GERMANY, ssrouou TO THEROESSLER & HASSLACHER CHEMICAL COMPANY, or NEW YORK, N. Y.,'A eosronimouon NEW YORK.

PRbcEss OF MAKING 'AL KALl 'PERVBORATES.

No. 842,473. Specification of Letters Patent. Patented Jan. 29, 1907.

Original application field February 7,1906, Serial No. 299,901-' Dividedand this application filed October 26,1906.

s rum.

To all whom it 11mg; concern: Be known that I, OTTO LIEBKNECHT, a

subject of the German Emperor, and a resident ofFrankfort-o11-the-\iain, Germany, have invented a certain new and usefulProcess of Making Alkali Perborates, of which the fol lowing is aspecification and which is a division of my application Serial No,299,901,

filed February 7,1906." IO making alkali perborates, which process hasproved-easy in operationandvof. a high degreeof efficiency. I havediscovered that if an alkali peroxid, such as sodium perokid, in i 5solution or in suspension inwater is treated i with an alkali borate,such as borax, and an i alkali bicarbonate, such as sodium bicar bonate,perborate is formed and precipitated in an al process, besides the'perbcrate a pure concentrated solution of carbonate'is obtained,-

Which can'be used for other pur oses; I

- In the following I have des'crihed one ilius trative method ofcarrying out the processes 25. applied to the manufacture of sodiumperborate, the features thereof being more particularly pointed outhereinafter inthe claims.

Three hundred. and eiglity-two parts of borax are stirred into twothousand parts of parts of sodium peroxidare added, together withsuflicient ice so that no increase in temerature takes place. Thengradually add two undred and fifty-four parts of sodium bicar- 3 5.bonateinpow'dered form and at the same time ice-water orice in suchquantities that at the end' of the operation'the temperature of themixture is preferably from 0 to 2 centigrade.

The reaction of the illustrative process set My invention relates to anew process of,

aline solution. As a result of my water,- and then threehundred andtwelve It will be of advantage to stirflduring'. the entire operation.When the reaction is coin- 1 pleted, the precipitate ,of perborate issepa 45 rated from the sodium-carbonate' solution, washed out, and driedin the usual manner; In the illustrative example statedv it is'obl viousthat many variations in proportions] and substances used, as well as inthe Size s of j5o the process itself, may be practiced Wit out; ideparting from the spirit of-my invention; For-instance, sodiumperoxid'ma'y: beIfreplaced by other alkali eroxid, suchassodium-potassium eroxi or potassium 'per- 55 oxid, as long as t ore isenou h. alkali in the formjof a salt present to: pro uceperborate as .aresult of the reaction, and instead of; sodium bicarbonate otheralkalibi'carbon- =atesi, such. as potassium bicarbonate, may be, on

use

r r Wlmt I claim, and desire to secure by Let-- tersl atent,1s 3

1. The process of making alkali perborates' which consists in reactingonborazi with an"; 6 alkali e'roxid anda'n alkali bicarbonate;

2. he process of making sodium 'perborate dium eroxid and an alkalibicarbonate. heprocess of making sodium perborate.

which-consists in reactinggon borax 'y'vi-th alkali'peroxid and sodium"bicarbonate. 'l

- 4. The'proce'ss of makingsodiumperborajee which consists in reactingon borakwithso dium peroxid'and sodium biearbonatej v In Witnesswhereofll have hereunto si ned my name in the presence of two shhscriing OTTO tins uncnr.

Witnesses HORSE. ZIEGLER,

JEAN GRUND.

whioh'consists in reacting-0n borax with so-l 1

